Sigma 60-600mm F4.5-6.3 DG OS HSM S is an Auto Focus (AF) Telephoto Zoom lens with 35mm FF max sensor coverage. When mounted on a 35mm FF sensor camera, it will give you an FF equivalent focal range of 60 - 600mm. With the max apertures of only f4.5 at 60mm, and f6.3 at 600mm, the lens is quite slow at both ends.
Sigma 60-600mm F4.5-6.3 DG OS HSM S is weather sealed which makes it an ideal lens for outdoor use, especially when coupled with a weather sealed camera body.